CN1040660A

CN1040660A - Piston of mud pump made up of polyurethane

Info

Publication number: CN1040660A
Application number: CN 89104953
Authority: CN
Inventors: 孟兰兴; 杨春盛
Original assignee: TRANSPORTATION CORP OF NORTH CHINA PETROLEUM ADMINISTRATION
Current assignee: TRANSPORTATION CORP OF NORTH CHINA PETROLEUM ADMINISTRATION
Priority date: 1989-07-17
Filing date: 1989-07-17
Publication date: 1990-03-21
Also published as: CN1010966B

Abstract

The present invention relates to a kind of Manufacturing material prescription, production technology and architecture advances of mud piston leather cup.Make piston cup owing to adopted TD1 and MD1 to add the synthetic encapsulating compound of epoxide, improved technical requirementss such as the oil resistant of piston, wear-resisting, hydrolysis resistance, low temperature resistant, anti-ozone, radiation hardness, Shao hard (A) is up to 90 ± 5.The present invention is at pump pressure 150-180kg/cm, and discharge capacity 201, sand content be 0.7-1%, under the average 2800 meters working condition of well depth, reached 1104 hours average length of working life, improved 5-14 times than prior art.

Description

Piston of mud pump made up of polyurethane

The present invention relates to a kind of Manufacturing material prescription, production technology and architecture advances of mud piston leather cup, belong to oil mine drilling mud pump application component.

The characteristics of oil drilling are that continuous operation time is long, and working condition is poor, and general work pressure is up to 200kg, 70 ℃ of operating temperatures, mud contain husky many, viscosity is big, and has certain corrosivity, critical piece-piston as slurry pump often needs to change, and has a strong impact on drilling progress.So, become one of difficult problem in the production working life of mud piston.Existing same device generally uses fine oil resistant rubber of fourth and S type polyurethane material leather cup.Use butadiene acrylonitrile rubber to make leather cup, wearing no resistance of it has only 80 hours working life; The like product of making of polyurethane material is as " the urethane rubber assembly type wellbore pump piston " of Jianghan Oil-field drilling-production equipment research institute in 1986 and Nanjing rubber plant joint research and development, at pump pressure 160-180kg/cm ²Down, average every pistons work life-span can reach 200 hours; 1988 five producers and R﹠D institution carry out the mud piston experiment in North China Oilfield and join in an open competition or contest in the match, three pistons of Arong Banner, the Inner Mongol rubber plant of lance race-entry reach 596 hours average life before ranking, but investigation result from the product lot quantity use, under actual working conditions, also have only about 200 hours average life.The working life of above-mentioned piston is low mainly to be to be subjected to effect of material performance.In addition, structure of piston is also unreasonable, and as shown in Figure 1, leather cup (3) has a break A at 1/2 place of total height, and during use, the A place is yielding, causes piston to be scrapped; In addition, the external diameter of steel core (1) is bigger than the external diameter of solid frame (2), and during work, steel core and cylinder sleeve directly rub, the cylinder sleeve that weares and teares easily, and sealing is also poor.

The objective of the invention is to overcome the above-mentioned deficiency of prior art, seek the higher material piston cup of a kind of abrasion resistance, and size and the structure of tackling steel core (1), leather cup (3) mutually improve, improve the working life of piston.

Technical solution of the present invention is: a kind of piston of mud pump made up of polyurethane, form by steel core (1), solid frame (2), leather cup (3), pressing plate (4), jump ring (5), it is characterized in that: leather cup (3) is to add composites such as polyester polyol (polyalcohols), chain extender with toluene diisocyanate (TDI) and toluene first 4-14 diisocyanate resin (MDI) to make, and the weight percentage of each component is: the polyalcohols of 63-68% (OH value 56); The chain extender of 6-13%; The MDI of 7-12%; The TDI of 12-20%, by the said components scope get 100% make precast body after, add epoxide and the pigment of 4-6% again; Technological points of the present invention also is: the working surface of leather cup (3) and casing wall friction begins to have according to the various outer diameter size 2 °-8 ° tapering from the base, and promptly α=1 is °-4 °; The external diameter of steel core (1) is than the little 1.5-2mm of external diameter of the solid frame of nylon (2).

The invention has the advantages that having adopted TDI and MDI to add the synthetic encapsulating compound of epoxide makes piston cup, technical requirementss such as the oil resistant of piston, wear-resisting, hydrolysis resistance, low temperature resistant, anti-ozone, radiation hardness have been improved, Shao hard (A) is up to 90 ± 5, specifically is compared with the prior art as table 1:

Leather cup Material Physics mechanical property contrast: table 1

Another advantage of the present invention is to improve on the appearance structure of piston: leather cup (3) changes from the base with the tapering of casing wall attrition surface, makes it stressed even, not yielding; The external diameter of steel core (1) is slightly less than the external diameter of the solid frame (2) of nylon, and steel material is not directly rubbed with cylinder sleeve.Under identical working condition, the present invention is 1104 hours average service time, reaches as high as 1264 hours, the comparison is as follows table 2:

Table 2:

Though cost of the present invention exceeds 0.7 times than prior art (The field mainly is the butadiene acrylonitrile rubber piston), improved 13.8 times than butadiene acrylonitrile rubber piston working life, improved 5.5 times than S type polyurethane rubber piston.

Description of drawings:

Fig. 1 is the structural drawing of existing product.

Fig. 2 is a structural drawing of the present invention.

Wherein: the 1-steel core; The solid frame of 2-; The 3-leather cup; The 4-pressing plate; The 5-jump ring.

Following Example is used to illustrate the only concrete enforcement of the present invention:

The percentage composition of each component is got: 64.5% polyalcohols; 7.2% chain extender; 28.3% TDI and MDI mixture, wherein the percentage composition of MDI gets 12%, and the percentage composition of TDI gets 16.3%, gets 4.8% epoxide in addition again.

Production technology:

Polyalcohols is heated to 140 ± 5 ° of dehydrations, is cooled to 60-80 ℃, add MDI, TDI, reacted 3.5 hours, heat to 140 ± 5 ℃ of degassings again, add epoxide, be placed in the baking box, temperature reaches 80 ± 5 ℃, continues reaction 8 hours, as precast body.

Sulfidation:

Coating release agent after mould is warmed to 120 ℃, above-mentioned precast body is added to chain extender stirred for 30 seconds and pour in the mould, on vulcanizer the pressurization 37 tons, heat 120 ℃, 30 minutes time, be placed on after the demoulding and be warmed to 80 ± 5 ℃ in the baking box, continue sulfuration 8 hours, one week of natural vulcanization goes out product.

The tapering of leather cup (3) is different and difference to some extent is ∮ 170 as external diameter according to piston external diameter, then α=3.85 °; Steel core (1) is less than solid frame (2) 1.5mm.

The spendable working condition of the present invention is: pump pressure 150-180kg/cm ², discharge capacity 20l, sand content is at 0.7-1%, average 2800 meters of well depth.

The present invention is series product, and specification is ∮ 140-∮ 180.

Claims

1, a kind of piston of mud pump made up of polyurethane is made up of steel core (1), solid frame (2), leather cup (3), pressing plate (4), jump ring (5), it is characterized in that:

A. leather cup (3) is to add composites such as polyester polyol (polyalcohols), chain extender with toluene diisocyanate (TDI) and toluene first 4--14 diisocyanate resin (MDI) to make, and the weight percentage of each component is: the polyalcohols of 63--68% (OH value 56); The chain extender of 6--13%; The MDI of 7--12%; The TDI of 12-20%,

B. after getting 100% by the said components scope, add epoxide and the pigment of 4--6% again,

C. leather cup (3) and casing wall attrition surface begin from the base to have 2 ° according to the various outer diameter size--8 ° tapering, and promptly α=1 is °-4 °,

D. the external diameter of steel core (1) is than the little 1.5--2mm of external diameter of the solid frame of nylon (2).

2, piston of mud pump made up of polyurethane according to claim 1 is characterized in that the percentage composition of each component of composite of leather cup (3) is: 64.5% polyalcohols; 7.2% chain extender; 28.3% TDI and MDI mixture.

3, piston of mud pump made up of polyurethane according to claim 2 is characterized in that the percentage composition of MDI in the composite of leather cup (3) gets 12%, and the percentage composition of TDI gets 16.3%.

4, piston of mud pump made up of polyurethane according to claim 1 is characterized in that the preparation process of leather cup (3) is as follows:

A. polyalcohols is heated to 140 ± 5 ° of dehydrations, is cooled to 60-80 ℃,

B. add MDI, TDI, reacted 3.5 hours,

C. heat again to 140 ± 5 ℃ of degassings,

D. add epoxide, be placed in the baking box, temperature reaches 80 ± 5 ℃, continues reaction 8 hours,

E. coating release agent after mould being warmed to 120 ℃ is added to above-mentioned precast body and stirred for 30 seconds and pour in the mould with chain extender,

F. on vulcanizer the pressurization 37 tons, heat 120 ℃, 30 minutes time,

G. be placed on after the demoulding and be warmed to 80 ± 5 ℃ in the baking box, continue sulfuration 8 hours,

H. one week of natural vulcanization goes out product.